Now that dev-python/PyQtWebEngine is now in the portage tree, the ebuilds for dev-python/PyQt5 (5.12+) need to have the webengine USE returned to them with a dependancy to dev-python/PyQtWebEngine. Reproducible: Always Steps to Reproduce: emerge any package requiring webengine and PyQt5 eg. qutebrowser Actual Results: Py qt will refuse to update to 5.12 and complains when applications are executed that mixing versions is not safe. Can not update PyQt5 because it dependent packages demand USE=webengine.
No, that would be backwards. Packages formerly depending on PyQt5[webengine] need to be fixed to alternatively accept PyQtWebEngine.